package main

import (
	"fmt"
	"time"
)

func task(id string) {
	for i := 0; i < 3; i++ {
		fmt.Printf("%v:%d\n", id, i)
		time.Sleep(time.Second)
	}
}
func main() {
	go task("我")
	go task("是")
	go task("中")
	go task("国")
	time.Sleep(time.Second * 10)
}
